---
title: MIDINotificationMessageID
framework: coremidi
role: symbol
role_heading: Enumeration
path: coremidi/midinotificationmessageid
---

# MIDINotificationMessageID

The types of state changes the system supports.

## Declaration

```swift
enum MIDINotificationMessageID
```

## Topics

### Change Types

- [MIDINotificationMessageID.msgSetupChanged](coremidi/midinotificationmessageid/msgsetupchanged.md)
- [MIDINotificationMessageID.msgObjectAdded](coremidi/midinotificationmessageid/msgobjectadded.md)
- [MIDINotificationMessageID.msgObjectRemoved](coremidi/midinotificationmessageid/msgobjectremoved.md)
- [MIDINotificationMessageID.msgPropertyChanged](coremidi/midinotificationmessageid/msgpropertychanged.md)
- [MIDINotificationMessageID.msgThruConnectionsChanged](coremidi/midinotificationmessageid/msgthruconnectionschanged.md)
- [MIDINotificationMessageID.msgSerialPortOwnerChanged](coremidi/midinotificationmessageid/msgserialportownerchanged.md)
- [MIDINotificationMessageID.msgIOError](coremidi/midinotificationmessageid/msgioerror.md)

### Enumeration Cases

- [MIDINotificationMessageID.msgInternalStart](coremidi/midinotificationmessageid/msginternalstart.md)

### Initializers

- [init(rawValue:)](coremidi/midinotificationmessageid/init(rawvalue:).md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Inspecting the Notification

- [messageID](coremidi/midinotification/messageid.md)
- [messageSize](coremidi/midinotification/messagesize.md)